Missing $LANG variable in Collection using tt_content

[Danny-HPH]

Describe the bug
If a Collection is using tt_content as a foreign_field and for example a typo3 form is added in this. The $LANG variable is not available in this scope and we get an Exception:
PHP Warning: Undefined global variable $LANG in /html/typo3-composer/vendor/typo3/cms-form/Classes/Domain/Configuration/FlexformConfiguration/Processors/FinisherOptionGenerator.php line 96

To Reproduce
Steps to reproduce the behavior:

1. Create an Element that uses a Collection with foreign_table: tt_content
2. Insert a Typo3 Form element into it
3. Open frontend and get the error

Expected behavior
The Form element gets the $LANG variable in this scope.

Screenshots

TYPO3 Version
13.4.5

Content Blocks Version:
1.1.6

[nhovratov]

Hey, I don't think it's a good idea to put a form plugin into a Collection. Have you considered a container?
Anyway, this is not a Content Blocks issue. Could you please forward this issue to TYPO3 forge?

[Danny-HPH]

ok thanks, i added a forge issue.

[nhovratov]

Related issue on forge: https://forge.typo3.org/issues/106158

[nhovratov]

Could you please provide the YAML configuration so we can quickly reproduce it?

[Danny-HPH]

Sure:

name: pxproject/specialbox
group: pxproject_content_elements
prefixFields: false
basics:
    - TYPO3/Appearance
fields:
  - identifier: image
    type: File
    maxitems: 1
    minitems: 1
    allowed: common-image-types
  - identifier: content
    type: Collection
    minitems: 1
    required: 1
    foreign_table: tt_content